I think it could say something along the lines of "SRV's runoff round encourages ranking the candidates", and so SRV is "a blend between rating and ranking systems" or "the best of both worlds".
The 2nd round strongly encourages giving different candidates different ratings, so it pressures you to consider which one you really prefer (a benefit of ranking systems)
It allows you to give two candidates the same score if you truly like them both equally (a benefit of rating systems)
It allows expressing strong vs weak preferences, instead of distorting them all to equal weight (a flaw of ranking systems)
So an SRV ballot is like a ranking ballot, but allowing unequal steps between the rankings and with the option for ties.
http://www.equal.vote/srvvsapproval talks about Score a little, but it was hard for me to understand how SRV is supposed to be better than Score. I think it would help to explain how strategic max/minimization works, and how SRV discourages it. For explaining how strategy works, I made some graphs here.
I think it could say something along the lines of "SRV's runoff round encourages ranking the candidates", and so SRV is "a blend between rating and ranking systems" or "the best of both worlds".
So an SRV ballot is like a ranking ballot, but allowing unequal steps between the rankings and with the option for ties.